Stackable interlocking planter box



FIG. 1 is a perspective view of a stackable interlocking planter boxshowing the present invention;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a side elevation view thereof, the front, rear, and oppositeside elevation views being identical thereto.

The broken lines depict environmental subject matter only and form nopart of the claimed design.

The ornamental design for a stackable interlocking planter box, as shownand described.